package com.martian.common.util;

import java.security.MessageDigest;
import java.util.Random;

/**
 * @author martian
 * @version V1.0.0
 * @Description
 * @date 2023-03-24 11:33
 */

public class Md5Util {

    private static final String hexDigIts[] = { "0", "1", "2", "3", "4", "5",
            "6", "7", "8", "9", "a", "b", "c", "d", "e", "f" };


    /** MD5加密 */
    public static String MD5Encode(String origin) {
        String charsetname = "utf-8";
        String resultString = null;
        try {
            resultString = new String(origin);
            MessageDigest md = MessageDigest.getInstance("MD5");
            if (null == charsetname || "".equals(charsetname)) {
                resultString = byteArrayToHexString(md.digest(resultString
                        .getBytes()));
            } else {
                resultString = byteArrayToHexString(md.digest(resultString
                        .getBytes(charsetname)));
            }
        } catch (Exception e) {
        }
        return resultString;
    }

    /**
     * MD5解密
     * @param instr
     * @return
     */
    public static String convertMD5(String instr){
        char[] a = instr.toCharArray();
        for(int i=0;i<a.length;i++){
            a[i] =(char) (a[i] ^ 't');
        }
        String s = new String(a);
        return s;
    }

    public static String byteArrayToHexString(byte b[]) {
        StringBuffer resultSb = new StringBuffer();
        for (int i = 0; i < b.length; i++) {
            resultSb.append(byteToHexString(b[i]));
        }
        return resultSb.toString();
    }

    public static String byteToHexString(byte b) {
        int n = b;
        if (n < 0) {
            n += 256;
        }
        int d1 = n / 16;
        int d2 = n % 16;
        return hexDigIts[d1] + hexDigIts[d2];
    }
    /**
     *自定义简单生成盐，是一个随机生成的长度为16的字符串，每一个字符是随机的十六进制字符
     */
    public static String salt() {
        Random random = new Random();
        StringBuilder sb = new StringBuilder(16);
        for (int i = 0; i < sb.capacity(); i++) {
            sb.append(hexDigIts[random.nextInt(16)]);
        }
        return sb.toString();
    }
    public static void main(String[] args) {

        System.out.println(MD5Encode("123456abc"));

    }
}
